1. 程式人生 > >JAVA各種OOM程式碼樣例及解決方法

JAVA各種OOM程式碼樣例及解決方法

  週末了,覺得我還有很多作業沒有寫,針對目前大家對OOM的型別不太熟悉,那麼我們來總結一下各種OOM出現的情況以及解決方法。

  我們把各種OOM的情況列出來,然後逐一進行程式碼編寫復現和提供解決方法。

  1. 堆溢位-java.lang.OutOfMemoryError: Java heap space。

  2. 棧溢位-java.lang.OutOfMemorryError。

  3. 棧溢位-java.lang.StackOverFlowError。

  4. 元資訊溢位-java.lang.OutOfMemoryError: Metaspace。

  5. 直接記憶體溢位-java.lang.OutOfMemoryError: Direct buffer memory。

  6. GC超限-java.lang.OutOfMemoryError: GC overhead limit exceeded。

 

  第一種,堆溢位異常,相信大家很常見。即堆內物件不能進行回收了,堆記憶體持續增大,這樣達到了堆記憶體的最大值,資料滿了,所以就出來了。我們直接放溢位的程式碼樣例。我們需要設定好idea的VM Options: -Xmx100m,這樣我們設定為最大堆記憶體,這樣執行起來就很快就出來錯誤了。

package oom;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * @author huangqingshi
 * @Date 2020-07-18
 */
public class HeapOOM {

    static class OOMObject {
    }

    public static void main(String[] args) throws InterruptedException {
        List<OOMObject> list = new ArrayList<>();

        while(true) {
//            TimeUnit.MILLISECONDS.sleep(1);
            list.add(new OOMObject());
        }
    }

}

  執行的異常如下,程式碼直接就出來我們看到的異常了。

/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java -Xmx100m -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/tools.jar:/Users/huangqingshi/Downloads/flink-project/target/classes:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-java/1.7.2/flink-java-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-core/1.7.2/flink-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-annotations/1.7.2/flink-annotations-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-metrics-core/1.7.2/flink-metrics-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/kryo/kryo/2.24.0/kryo-2.24.0.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/minlog/minlog/1.2/minlog-1.2.jar:/Users/huangqingshi/.m2/repository/org/objenesis/objenesis/2.1/objenesis-2.1.jar:/Users/huangqingshi/.m2/repository/commons-collections/commons-collections/3.2.2/commons-collections-3.2.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-compress/1.18/commons-compress-1.18.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-asm/5.0.4-5.0/flink-shaded-asm-5.0.4-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-lang3/3.3.2/commons-lang3-3.3.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-math3/3.5/commons-math3-3.5.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-api/1.7.15/slf4j-api-1.7.15.jar:/Users/huangqingshi/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/force-shading/1.7.2/force-shading-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-streaming-java_2.11/1.7.2/flink-streaming-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-runtime_2.11/1.7.2/flink-runtime_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-queryable-state-client-java_2.11/1.7.2/flink-queryable-state-client-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-hadoop-fs/1.7.2/flink-hadoop-fs-1.7.2.jar:/Users/huangqingshi/.m2/repository/commons-io/commons-io/2.4/commons-io-2.4.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-netty/4.1.24.Final-5.0/flink-shaded-netty-4.1.24.Final-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-jackson/2.7.9-5.0/flink-shaded-jackson-2.7.9-5.0.jar:/Users/huangqingshi/.m2/repository/commons-cli/commons-cli/1.3.1/commons-cli-1.3.1.jar:/Users/huangqingshi/.m2/repository/org/javassist/javassist/3.19.0-GA/javassist-3.19.0-GA.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-actor_2.11/2.4.20/akka-actor_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/config/1.3.0/config-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-java8-compat_2.11/0.7.0/scala-java8-compat_2.11-0.7.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-stream_2.11/2.4.20/akka-stream_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/reactivestreams/reactive-streams/1.0.0/reactive-streams-1.0.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/ssl-config-core_2.11/0.2.1/ssl-config-core_2.11-0.2.1.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-parser-combinators_2.11/1.0.4/scala-parser-combinators_2.11-1.0.4.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-protobuf_2.11/2.4.20/akka-protobuf_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-slf4j_2.11/2.4.20/akka-slf4j_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/clapper/grizzled-slf4j_2.11/1.3.2/grizzled-slf4j_2.11-1.3.2.jar:/Users/huangqingshi/.m2/repository/com/github/scopt/scopt_2.11/3.5.0/scopt_2.11-3.5.0.jar:/Users/huangqingshi/.m2/repository/org/xerial/snappy/snappy-java/1.1.4/snappy-java-1.1.4.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill_2.11/0.7.6/chill_2.11-0.7.6.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill-java/0.7.6/chill-java-0.7.6.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-clients_2.11/1.7.2/flink-clients_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-optimizer_2.11/1.7.2/flink-optimizer_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-guava/18.0-5.0/flink-shaded-guava-18.0-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.10_2.11/1.7.2/flink-connector-kafka-0.10_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.9_2.11/1.7.2/flink-connector-kafka-0.9_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-base_2.11/1.7.2/flink-connector-kafka-base_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/kafka/kafka-clients/0.10.2.1/kafka-clients-0.10.2.1.jar:/Users/huangqingshi/.m2/repository/net/jpountz/lz4/lz4/1.3.0/lz4-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-log4j12/1.7.7/slf4j-log4j12-1.7.7.jar:/Users/huangqingshi/.m2/repository/log4j/log4j/1.2.17/log4j-1.2.17.jar:/Users/huangqingshi/.m2/repository/com/alibaba/fastjson/1.2.62/fastjson-1.2.62.jar:/Users/huangqingshi/.m2/repository/com/google/guava/guava/28.1-jre/guava-28.1-jre.jar:/Users/huangqingshi/.m2/repository/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar:/Users/huangqingshi/.m2/repository/com/google/guava/listenablefuture/9999.0-empty-to-avoid-conflict-with-guava/listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:/Users/huangqingshi/.m2/repository/org/checkerframework/checker-qual/2.8.1/checker-qual-2.8.1.jar:/Users/huangqingshi/.m2/repository/com/google/errorprone/error_prone_annotations/2.3.2/error_prone_annotations-2.3.2.jar:/Users/huangqingshi/.m2/repository/com/google/j2objc/j2objc-annotations/1.3/j2objc-annotations-1.3.jar:/Users/huangqingshi/.m2/repository/org/codehaus/mojo/animal-sniffer-annotations/1.18/animal-sniffer-annotations-1.18.jar:/Users/huangqingshi/.m2/repository/redis/clients/jedis/3.1.0/jedis-3.1.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-pool2/2.6.2/commons-pool2-2.6.2.jar:/Users/huangqingshi/.m2/repository/mysql/mysql-connector-java/8.0.16/mysql-connector-java-8.0.16.jar:/Users/huangqingshi/.m2/repository/com/google/protobuf/protobuf-java/3.6.1/protobuf-java-3.6.1.jar:/Users/huangqingshi/.m2/repository/com/alibaba/druid/1.1.20/druid-1.1.20.jar oom.HeapOOM
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:3210)
    at java.util.Arrays.copyOf(Arrays.java:3181)
    at java.util.ArrayList.grow(ArrayList.java:261)
    at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:235)
    at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:227)
    at java.util.ArrayList.add(ArrayList.java:458)
    at oom.HeapOOM.main(HeapOOM.java:21)

Process finished with exit code 1

  細心的同學可以發現我在裡邊設定了一個休眠,目的是我們看一下堆記憶體的結構和資料圖。我們將休眠程式碼開啟,然後開啟JDK自帶的jconsole命令,連線上之後我們看一下概覽圖,通過下圖我們發現堆記憶體持續不斷的增長。

 

 

   我們開啟記憶體介面,看一下記憶體,然後點一下GC按鈕,這個時候會有一些類進行回收,但是還是會繼續增長,看一下下面的圖。

 

 

 點開資訊標籤看一下。經過幾次GC回收之後,類的資料量還是變化不大,說明沒有進行回收。

  

  以上這種情況的解決方法就是找到問題點,分析哪個地方是否儲存了大量類沒有被回收的情況,通過JMAP命令將線上的堆記憶體匯出來後進行分析。

  第二種情況,我們看一下棧溢位的情況,“上菜”,下面的程式碼就是無限的建立執行緒,直到沒法再建立執行緒。

package oom;

import java.util.concurrent.TimeUnit;

/**
 * @author huangqingshi
 * @Date 2020-07-18
 */
public class StackOOM {

    public static void infiniteRun() {
        while(true) {
            Thread thread = new Thread(() -> {

                while (true) {
                    try {
                        TimeUnit.HOURS.sleep(1);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

            });
            thread.start();
        }
    }

    public static void main(String[] args) {
        infiniteRun();
    }

}

  丟擲來的異常如下,如果真的需要建立執行緒,我們需要調整幀棧的大小-Xss512k,預設幀棧大小為1M,如果設定小了,可以建立更多執行緒。

/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java -Xss512k -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/tools.jar:/Users/huangqingshi/Downloads/flink-project/target/classes:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-java/1.7.2/flink-java-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-core/1.7.2/flink-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-annotations/1.7.2/flink-annotations-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-metrics-core/1.7.2/flink-metrics-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/kryo/kryo/2.24.0/kryo-2.24.0.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/minlog/minlog/1.2/minlog-1.2.jar:/Users/huangqingshi/.m2/repository/org/objenesis/objenesis/2.1/objenesis-2.1.jar:/Users/huangqingshi/.m2/repository/commons-collections/commons-collections/3.2.2/commons-collections-3.2.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-compress/1.18/commons-compress-1.18.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-asm/5.0.4-5.0/flink-shaded-asm-5.0.4-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-lang3/3.3.2/commons-lang3-3.3.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-math3/3.5/commons-math3-3.5.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-api/1.7.15/slf4j-api-1.7.15.jar:/Users/huangqingshi/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/force-shading/1.7.2/force-shading-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-streaming-java_2.11/1.7.2/flink-streaming-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-runtime_2.11/1.7.2/flink-runtime_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-queryable-state-client-java_2.11/1.7.2/flink-queryable-state-client-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-hadoop-fs/1.7.2/flink-hadoop-fs-1.7.2.jar:/Users/huangqingshi/.m2/repository/commons-io/commons-io/2.4/commons-io-2.4.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-netty/4.1.24.Final-5.0/flink-shaded-netty-4.1.24.Final-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-jackson/2.7.9-5.0/flink-shaded-jackson-2.7.9-5.0.jar:/Users/huangqingshi/.m2/repository/commons-cli/commons-cli/1.3.1/commons-cli-1.3.1.jar:/Users/huangqingshi/.m2/repository/org/javassist/javassist/3.19.0-GA/javassist-3.19.0-GA.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-actor_2.11/2.4.20/akka-actor_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/config/1.3.0/config-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-java8-compat_2.11/0.7.0/scala-java8-compat_2.11-0.7.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-stream_2.11/2.4.20/akka-stream_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/reactivestreams/reactive-streams/1.0.0/reactive-streams-1.0.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/ssl-config-core_2.11/0.2.1/ssl-config-core_2.11-0.2.1.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-parser-combinators_2.11/1.0.4/scala-parser-combinators_2.11-1.0.4.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-protobuf_2.11/2.4.20/akka-protobuf_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-slf4j_2.11/2.4.20/akka-slf4j_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/clapper/grizzled-slf4j_2.11/1.3.2/grizzled-slf4j_2.11-1.3.2.jar:/Users/huangqingshi/.m2/repository/com/github/scopt/scopt_2.11/3.5.0/scopt_2.11-3.5.0.jar:/Users/huangqingshi/.m2/repository/org/xerial/snappy/snappy-java/1.1.4/snappy-java-1.1.4.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill_2.11/0.7.6/chill_2.11-0.7.6.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill-java/0.7.6/chill-java-0.7.6.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-clients_2.11/1.7.2/flink-clients_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-optimizer_2.11/1.7.2/flink-optimizer_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-guava/18.0-5.0/flink-shaded-guava-18.0-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.10_2.11/1.7.2/flink-connector-kafka-0.10_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.9_2.11/1.7.2/flink-connector-kafka-0.9_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-base_2.11/1.7.2/flink-connector-kafka-base_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/kafka/kafka-clients/0.10.2.1/kafka-clients-0.10.2.1.jar:/Users/huangqingshi/.m2/repository/net/jpountz/lz4/lz4/1.3.0/lz4-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-log4j12/1.7.7/slf4j-log4j12-1.7.7.jar:/Users/huangqingshi/.m2/repository/log4j/log4j/1.2.17/log4j-1.2.17.jar:/Users/huangqingshi/.m2/repository/com/alibaba/fastjson/1.2.62/fastjson-1.2.62.jar:/Users/huangqingshi/.m2/repository/com/google/guava/guava/28.1-jre/guava-28.1-jre.jar:/Users/huangqingshi/.m2/repository/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar:/Users/huangqingshi/.m2/repository/com/google/guava/listenablefuture/9999.0-empty-to-avoid-conflict-with-guava/listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:/Users/huangqingshi/.m2/repository/org/checkerframework/checker-qual/2.8.1/checker-qual-2.8.1.jar:/Users/huangqingshi/.m2/repository/com/google/errorprone/error_prone_annotations/2.3.2/error_prone_annotations-2.3.2.jar:/Users/huangqingshi/.m2/repository/com/google/j2objc/j2objc-annotations/1.3/j2objc-annotations-1.3.jar:/Users/huangqingshi/.m2/repository/org/codehaus/mojo/animal-sniffer-annotations/1.18/animal-sniffer-annotations-1.18.jar:/Users/huangqingshi/.m2/repository/redis/clients/jedis/3.1.0/jedis-3.1.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-pool2/2.6.2/commons-pool2-2.6.2.jar:/Users/huangqingshi/.m2/repository/mysql/mysql-connector-java/8.0.16/mysql-connector-java-8.0.16.jar:/Users/huangqingshi/.m2/repository/com/google/protobuf/protobuf-java/3.6.1/protobuf-java-3.6.1.jar:/Users/huangqingshi/.m2/repository/com/alibaba/druid/1.1.20/druid-1.1.20.jar oom.StackOOM
Exception in thread "main" java.lang.OutOfMemoryError: unable to create new native thread
    at java.lang.Thread.start0(Native Method)
    at java.lang.Thread.start(Thread.java:717)
    at oom.StackOOM.infiniteRun(StackOOM.java:24)
    at oom.StackOOM.main(StackOOM.java:29)

Process finished with exit code 130 (interrupted by signal 2: SIGINT)

  以上這種情況是幀棧不夠用了,如果出現了這種情況,我們需要了解什麼地方建立了很多執行緒,線上程式需要用jstack命令,將當前執行緒的狀態匯出來放到檔案裡邊,然後將檔案上傳到fastthread.io網站上進行分析。

  第三種情況,我們看一下棧溢位的另一種情況,這就是棧的StackOverFlow的情況。下面就是一個死迴圈遞迴呼叫。

package oom;

/**
 * @author huangqingshi
 * @Date 2020-07-18
 */
public class StackOFE {

    public static void stackOverFlowErrorMethod() {
        stackOverFlowErrorMethod();
    }

    public static void main(String[] args) {
        stackOverFlowErrorMethod();
    }

}

   執行之後出現的錯誤如下,程式每次遞迴的時候,程式會把資料結果壓入棧,包括裡邊的指標等,這個時候就需要幀棧大一些才能承受住更多的遞迴呼叫。通過-Xss進行設定,上邊的例子需要設定小一些,以分配更多的幀棧,這次是一個幀棧需要記錄程式資料,所以需要更大的值。

/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java -Xss2m -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/tools.jar:/Users/huangqingshi/Downloads/flink-project/target/classes:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-java/1.7.2/flink-java-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-core/1.7.2/flink-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-annotations/1.7.2/flink-annotations-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-metrics-core/1.7.2/flink-metrics-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/kryo/kryo/2.24.0/kryo-2.24.0.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/minlog/minlog/1.2/minlog-1.2.jar:/Users/huangqingshi/.m2/repository/org/objenesis/objenesis/2.1/objenesis-2.1.jar:/Users/huangqingshi/.m2/repository/commons-collections/commons-collections/3.2.2/commons-collections-3.2.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-compress/1.18/commons-compress-1.18.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-asm/5.0.4-5.0/flink-shaded-asm-5.0.4-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-lang3/3.3.2/commons-lang3-3.3.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-math3/3.5/commons-math3-3.5.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-api/1.7.15/slf4j-api-1.7.15.jar:/Users/huangqingshi/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/force-shading/1.7.2/force-shading-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-streaming-java_2.11/1.7.2/flink-streaming-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-runtime_2.11/1.7.2/flink-runtime_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-queryable-state-client-java_2.11/1.7.2/flink-queryable-state-client-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-hadoop-fs/1.7.2/flink-hadoop-fs-1.7.2.jar:/Users/huangqingshi/.m2/repository/commons-io/commons-io/2.4/commons-io-2.4.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-netty/4.1.24.Final-5.0/flink-shaded-netty-4.1.24.Final-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-jackson/2.7.9-5.0/flink-shaded-jackson-2.7.9-5.0.jar:/Users/huangqingshi/.m2/repository/commons-cli/commons-cli/1.3.1/commons-cli-1.3.1.jar:/Users/huangqingshi/.m2/repository/org/javassist/javassist/3.19.0-GA/javassist-3.19.0-GA.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-actor_2.11/2.4.20/akka-actor_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/config/1.3.0/config-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-java8-compat_2.11/0.7.0/scala-java8-compat_2.11-0.7.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-stream_2.11/2.4.20/akka-stream_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/reactivestreams/reactive-streams/1.0.0/reactive-streams-1.0.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/ssl-config-core_2.11/0.2.1/ssl-config-core_2.11-0.2.1.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-parser-combinators_2.11/1.0.4/scala-parser-combinators_2.11-1.0.4.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-protobuf_2.11/2.4.20/akka-protobuf_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-slf4j_2.11/2.4.20/akka-slf4j_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/clapper/grizzled-slf4j_2.11/1.3.2/grizzled-slf4j_2.11-1.3.2.jar:/Users/huangqingshi/.m2/repository/com/github/scopt/scopt_2.11/3.5.0/scopt_2.11-3.5.0.jar:/Users/huangqingshi/.m2/repository/org/xerial/snappy/snappy-java/1.1.4/snappy-java-1.1.4.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill_2.11/0.7.6/chill_2.11-0.7.6.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill-java/0.7.6/chill-java-0.7.6.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-clients_2.11/1.7.2/flink-clients_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-optimizer_2.11/1.7.2/flink-optimizer_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-guava/18.0-5.0/flink-shaded-guava-18.0-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.10_2.11/1.7.2/flink-connector-kafka-0.10_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.9_2.11/1.7.2/flink-connector-kafka-0.9_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-base_2.11/1.7.2/flink-connector-kafka-base_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/kafka/kafka-clients/0.10.2.1/kafka-clients-0.10.2.1.jar:/Users/huangqingshi/.m2/repository/net/jpountz/lz4/lz4/1.3.0/lz4-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-log4j12/1.7.7/slf4j-log4j12-1.7.7.jar:/Users/huangqingshi/.m2/repository/log4j/log4j/1.2.17/log4j-1.2.17.jar:/Users/huangqingshi/.m2/repository/com/alibaba/fastjson/1.2.62/fastjson-1.2.62.jar:/Users/huangqingshi/.m2/repository/com/google/guava/guava/28.1-jre/guava-28.1-jre.jar:/Users/huangqingshi/.m2/repository/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar:/Users/huangqingshi/.m2/repository/com/google/guava/listenablefuture/9999.0-empty-to-avoid-conflict-with-guava/listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:/Users/huangqingshi/.m2/repository/org/checkerframework/checker-qual/2.8.1/checker-qual-2.8.1.jar:/Users/huangqingshi/.m2/repository/com/google/errorprone/error_prone_annotations/2.3.2/error_prone_annotations-2.3.2.jar:/Users/huangqingshi/.m2/repository/com/google/j2objc/j2objc-annotations/1.3/j2objc-annotations-1.3.jar:/Users/huangqingshi/.m2/repository/org/codehaus/mojo/animal-sniffer-annotations/1.18/animal-sniffer-annotations-1.18.jar:/Users/huangqingshi/.m2/repository/redis/clients/jedis/3.1.0/jedis-3.1.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-pool2/2.6.2/commons-pool2-2.6.2.jar:/Users/huangqingshi/.m2/repository/mysql/mysql-connector-java/8.0.16/mysql-connector-java-8.0.16.jar:/Users/huangqingshi/.m2/repository/com/google/protobuf/protobuf-java/3.6.1/protobuf-java-3.6.1.jar:/Users/huangqingshi/.m2/repository/com/alibaba/druid/1.1.20/druid-1.1.20.jar oom.StackOFE
Exception in thread "main" java.lang.StackOverflowError
    at oom.StackOFE.stackOverFlowErrorMethod(StackOFE.java:10)
    at oom.StackOFE.stackOverFlowErrorMethod(StackOFE.java:10)
    at oom.StackOFE.stackOverFlowErrorMethod(StackOFE.java:10)
    at oom.StackOFE.stackOverFlowErrorMethod(StackOFE.java:10)
    at oom.StackOFE.stackOverFlowErrorMethod(StackOFE.java:10)
    at oom.StackOFE.stackOverFlowErrorMethod(StackOFE.java:10)

  遇到上面的情況下,那麼就需要通過jstack將執行緒資料導到檔案進行分析。找到遞迴的點,如果程式就是需要遞迴的次數的話,那麼這個時候就需要增大幀棧的大小以適應程式。

  第四種情況,元資料區域溢位,元資料區域也成為方法區,儲存著類的相關資訊,常量池,方法描述符,欄位描述符,執行時產生大量的類就會造成這個區域的溢位。我們執行的時候指定一下元資料區域的大小,設定到idea的VM options裡邊:-XX:MetaspaceSize=10M -XX:MaxMetaspaceSize=30M。

package oom;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

/**
 * @author huangqingshi
 * @Date 2020-07-18
 */
public class MetaspaceOOM {

    static class OOMObject{}

    public static void main(String[] args) {
        while (true) {
            Enhancer enhancer = new Enhancer();
            enhancer.setSuperclass(OOMObject.class);
            enhancer.setUseCache(false);
            enhancer.setCallback(new MethodInterceptor() {
                public Object intercept(Object obj, Method method,
                                        Object[] args, MethodProxy proxy) throws Throwable {
                    return proxy.invokeSuper(obj, args);
                }
            });
            enhancer.create();
        }
    }

}

  執行的結果如下,元資料資訊溢位了。這種情況產生的原因有: 通過CBLIG大量生成類,導致Meta資訊滿了;JDK7的時候使用String.intern()不當,會產生大量常量資料;載入大量的jsp以及動態生成jsp檔案。我們需要調整元資料空間的大小,如果調大了之後還出現了這種異常,我們需要分析哪裡出現的溢位並fix掉。

/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java -XX:MetaspaceSize=10M -XX:MaxMetaspaceSize=30M -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/tools.jar:/Users/huangqingshi/Downloads/flink-project/target/classes:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-java/1.7.2/flink-java-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-core/1.7.2/flink-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-annotations/1.7.2/flink-annotations-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-metrics-core/1.7.2/flink-metrics-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/kryo/kryo/2.24.0/kryo-2.24.0.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/minlog/minlog/1.2/minlog-1.2.jar:/Users/huangqingshi/.m2/repository/org/objenesis/objenesis/2.1/objenesis-2.1.jar:/Users/huangqingshi/.m2/repository/commons-collections/commons-collections/3.2.2/commons-collections-3.2.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-compress/1.18/commons-compress-1.18.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-asm/5.0.4-5.0/flink-shaded-asm-5.0.4-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-lang3/3.3.2/commons-lang3-3.3.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-math3/3.5/commons-math3-3.5.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-api/1.7.15/slf4j-api-1.7.15.jar:/Users/huangqingshi/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/force-shading/1.7.2/force-shading-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-streaming-java_2.11/1.7.2/flink-streaming-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-runtime_2.11/1.7.2/flink-runtime_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-queryable-state-client-java_2.11/1.7.2/flink-queryable-state-client-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-hadoop-fs/1.7.2/flink-hadoop-fs-1.7.2.jar:/Users/huangqingshi/.m2/repository/commons-io/commons-io/2.4/commons-io-2.4.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-netty/4.1.24.Final-5.0/flink-shaded-netty-4.1.24.Final-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-jackson/2.7.9-5.0/flink-shaded-jackson-2.7.9-5.0.jar:/Users/huangqingshi/.m2/repository/commons-cli/commons-cli/1.3.1/commons-cli-1.3.1.jar:/Users/huangqingshi/.m2/repository/org/javassist/javassist/3.19.0-GA/javassist-3.19.0-GA.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-actor_2.11/2.4.20/akka-actor_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/config/1.3.0/config-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-java8-compat_2.11/0.7.0/scala-java8-compat_2.11-0.7.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-stream_2.11/2.4.20/akka-stream_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/reactivestreams/reactive-streams/1.0.0/reactive-streams-1.0.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/ssl-config-core_2.11/0.2.1/ssl-config-core_2.11-0.2.1.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-parser-combinators_2.11/1.0.4/scala-parser-combinators_2.11-1.0.4.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-protobuf_2.11/2.4.20/akka-protobuf_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-slf4j_2.11/2.4.20/akka-slf4j_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/clapper/grizzled-slf4j_2.11/1.3.2/grizzled-slf4j_2.11-1.3.2.jar:/Users/huangqingshi/.m2/repository/com/github/scopt/scopt_2.11/3.5.0/scopt_2.11-3.5.0.jar:/Users/huangqingshi/.m2/repository/org/xerial/snappy/snappy-java/1.1.4/snappy-java-1.1.4.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill_2.11/0.7.6/chill_2.11-0.7.6.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill-java/0.7.6/chill-java-0.7.6.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-clients_2.11/1.7.2/flink-clients_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-optimizer_2.11/1.7.2/flink-optimizer_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-guava/18.0-5.0/flink-shaded-guava-18.0-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.10_2.11/1.7.2/flink-connector-kafka-0.10_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.9_2.11/1.7.2/flink-connector-kafka-0.9_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-base_2.11/1.7.2/flink-connector-kafka-base_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/kafka/kafka-clients/0.10.2.1/kafka-clients-0.10.2.1.jar:/Users/huangqingshi/.m2/repository/net/jpountz/lz4/lz4/1.3.0/lz4-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-log4j12/1.7.7/slf4j-log4j12-1.7.7.jar:/Users/huangqingshi/.m2/repository/log4j/log4j/1.2.17/log4j-1.2.17.jar:/Users/huangqingshi/.m2/repository/com/alibaba/fastjson/1.2.62/fastjson-1.2.62.jar:/Users/huangqingshi/.m2/repository/com/google/guava/guava/28.1-jre/guava-28.1-jre.jar:/Users/huangqingshi/.m2/repository/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar:/Users/huangqingshi/.m2/repository/com/google/guava/listenablefuture/9999.0-empty-to-avoid-conflict-with-guava/listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:/Users/huangqingshi/.m2/repository/org/checkerframework/checker-qual/2.8.1/checker-qual-2.8.1.jar:/Users/huangqingshi/.m2/repository/com/google/errorprone/error_prone_annotations/2.3.2/error_prone_annotations-2.3.2.jar:/Users/huangqingshi/.m2/repository/com/google/j2objc/j2objc-annotations/1.3/j2objc-annotations-1.3.jar:/Users/huangqingshi/.m2/repository/org/codehaus/mojo/animal-sniffer-annotations/1.18/animal-sniffer-annotations-1.18.jar:/Users/huangqingshi/.m2/repository/redis/clients/jedis/3.1.0/jedis-3.1.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-pool2/2.6.2/commons-pool2-2.6.2.jar:/Users/huangqingshi/.m2/repository/mysql/mysql-connector-java/8.0.16/mysql-connector-java-8.0.16.jar:/Users/huangqingshi/.m2/repository/com/google/protobuf/protobuf-java/3.6.1/protobuf-java-3.6.1.jar:/Users/huangqingshi/.m2/repository/com/alibaba/druid/1.1.20/druid-1.1.20.jar:/Users/huangqingshi/.m2/repository/cglib/cglib/3.2.5/cglib-3.2.5.jar:/Users/huangqingshi/.m2/repository/org/ow2/asm/asm/5.2/asm-5.2.jar:/Users/huangqingshi/.m2/repository/org/apache/ant/ant/1.9.6/ant-1.9.6.jar:/Users/huangqingshi/.m2/repository/org/apache/ant/ant-launcher/1.9.6/ant-launcher-1.9.6.jar oom.MetaspaceOOM
Exception in thread "main" java.lang.OutOfMemoryError: Metaspace
    at net.sf.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:345)
    at net.sf.cglib.proxy.Enhancer.generate(Enhancer.java:492)
    at net.sf.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:114)
    at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:291)
    at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:480)
    at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:305)
    at oom.MetaspaceOOM.main(MetaspaceOOM.java:28)

Process finished with exit code 1

  第五種情況,直接記憶體溢位,我們除了使用堆記憶體外,我們還可能用直接記憶體,即堆外記憶體。NIO為了提高效能,避免在Java Heap和native Heap中切換,所以使用直接記憶體,預設情況下,直接記憶體的大小和對記憶體大小一致。堆外記憶體不受JVM的限制,但是受制於機器整體記憶體的大小限制。如下程式碼設定堆最大記憶體為128m,直接記憶體為100m,然後我們每次分配1M放到list裡邊。  

-Xmx128m -XX:MaxDirectMemorySize=100M

package oom;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

/**
 * @author huangqingshi
 * @Date 2020-07-18
 */
public class DirectBufferOOM {

    public static void main(String[] args) {
        final int _1M = 1024 * 1024 * 1;
        List<ByteBuffer> buffers = new ArrayList<>();
        int count = 1;
        while (true) {
            ByteBuffer byteBuffer = ByteBuffer.allocateDirect(_1M);
            buffers.add(byteBuffer);
            System.out.println(count++);
        }

    }
}

  這個時候,當輸出100次的時候,下次再分配的時候會報OOM-Direct buffer memory。

/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java -Xmx128m -XX:MaxDirectMemorySize=100M -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/tools.jar:/Users/huangqingshi/Downloads/flink-project/target/classes:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-java/1.7.2/flink-java-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-core/1.7.2/flink-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-annotations/1.7.2/flink-annotations-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-metrics-core/1.7.2/flink-metrics-core-1.7.2.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/kryo/kryo/2.24.0/kryo-2.24.0.jar:/Users/huangqingshi/.m2/repository/com/esotericsoftware/minlog/minlog/1.2/minlog-1.2.jar:/Users/huangqingshi/.m2/repository/org/objenesis/objenesis/2.1/objenesis-2.1.jar:/Users/huangqingshi/.m2/repository/commons-collections/commons-collections/3.2.2/commons-collections-3.2.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-compress/1.18/commons-compress-1.18.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-asm/5.0.4-5.0/flink-shaded-asm-5.0.4-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-lang3/3.3.2/commons-lang3-3.3.2.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-math3/3.5/commons-math3-3.5.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-api/1.7.15/slf4j-api-1.7.15.jar:/Users/huangqingshi/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/force-shading/1.7.2/force-shading-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-streaming-java_2.11/1.7.2/flink-streaming-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-runtime_2.11/1.7.2/flink-runtime_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-queryable-state-client-java_2.11/1.7.2/flink-queryable-state-client-java_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-hadoop-fs/1.7.2/flink-hadoop-fs-1.7.2.jar:/Users/huangqingshi/.m2/repository/commons-io/commons-io/2.4/commons-io-2.4.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-netty/4.1.24.Final-5.0/flink-shaded-netty-4.1.24.Final-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-jackson/2.7.9-5.0/flink-shaded-jackson-2.7.9-5.0.jar:/Users/huangqingshi/.m2/repository/commons-cli/commons-cli/1.3.1/commons-cli-1.3.1.jar:/Users/huangqingshi/.m2/repository/org/javassist/javassist/3.19.0-GA/javassist-3.19.0-GA.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/scala-library/2.11.12/scala-library-2.11.12.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-actor_2.11/2.4.20/akka-actor_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/config/1.3.0/config-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-java8-compat_2.11/0.7.0/scala-java8-compat_2.11-0.7.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-stream_2.11/2.4.20/akka-stream_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/reactivestreams/reactive-streams/1.0.0/reactive-streams-1.0.0.jar:/Users/huangqingshi/.m2/repository/com/typesafe/ssl-config-core_2.11/0.2.1/ssl-config-core_2.11-0.2.1.jar:/Users/huangqingshi/.m2/repository/org/scala-lang/modules/scala-parser-combinators_2.11/1.0.4/scala-parser-combinators_2.11-1.0.4.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-protobuf_2.11/2.4.20/akka-protobuf_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/com/typesafe/akka/akka-slf4j_2.11/2.4.20/akka-slf4j_2.11-2.4.20.jar:/Users/huangqingshi/.m2/repository/org/clapper/grizzled-slf4j_2.11/1.3.2/grizzled-slf4j_2.11-1.3.2.jar:/Users/huangqingshi/.m2/repository/com/github/scopt/scopt_2.11/3.5.0/scopt_2.11-3.5.0.jar:/Users/huangqingshi/.m2/repository/org/xerial/snappy/snappy-java/1.1.4/snappy-java-1.1.4.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill_2.11/0.7.6/chill_2.11-0.7.6.jar:/Users/huangqingshi/.m2/repository/com/twitter/chill-java/0.7.6/chill-java-0.7.6.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-clients_2.11/1.7.2/flink-clients_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-optimizer_2.11/1.7.2/flink-optimizer_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-shaded-guava/18.0-5.0/flink-shaded-guava-18.0-5.0.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.10_2.11/1.7.2/flink-connector-kafka-0.10_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-0.9_2.11/1.7.2/flink-connector-kafka-0.9_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/flink/flink-connector-kafka-base_2.11/1.7.2/flink-connector-kafka-base_2.11-1.7.2.jar:/Users/huangqingshi/.m2/repository/org/apache/kafka/kafka-clients/0.10.2.1/kafka-clients-0.10.2.1.jar:/Users/huangqingshi/.m2/repository/net/jpountz/lz4/lz4/1.3.0/lz4-1.3.0.jar:/Users/huangqingshi/.m2/repository/org/slf4j/slf4j-log4j12/1.7.7/slf4j-log4j12-1.7.7.jar:/Users/huangqingshi/.m2/repository/log4j/log4j/1.2.17/log4j-1.2.17.jar:/Users/huangqingshi/.m2/repository/com/alibaba/fastjson/1.2.62/fastjson-1.2.62.jar:/Users/huangqingshi/.m2/repository/com/google/guava/guava/28.1-jre/guava-28.1-jre.jar:/Users/huangqingshi/.m2/repository/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar:/Users/huangqingshi/.m2/repository/com/google/guava/listenablefuture/9999.0-empty-to-avoid-conflict-with-guava/listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:/Users/huangqingshi/.m2/repository/org/checkerframework/checker-qual/2.8.1/checker-qual-2.8.1.jar:/Users/huangqingshi/.m2/repository/com/google/errorprone/error_prone_annotations/2.3.2/error_prone_annotations-2.3.2.jar:/Users/huangqingshi/.m2/repository/com/google/j2objc/j2objc-annotations/1.3/j2objc-annotations-1.3.jar:/Users/huangqingshi/.m2/repository/org/codehaus/mojo/animal-sniffer-annotations/1.18/animal-sniffer-annotations-1.18.jar:/Users/huangqingshi/.m2/repository/redis/clients/jedis/3.1.0/jedis-3.1.0.jar:/Users/huangqingshi/.m2/repository/org/apache/commons/commons-pool2/2.6.2/commons-pool2-2.6.2.jar:/Users/huangqingshi/.m2/repository/mysql/mysql-connector-java/8.0.16/mysql-connector-java-8.0.16.jar:/Users/huangqingshi/.m2/repository/com/google/protobuf/protobuf-java/3.6.1/protobuf-java-3.6.1.jar:/Users/huangqingshi/.m2/repository/com/alibaba/druid/1.1.20/druid-1.1.20.jar:/Users/huangqingshi/.m2/repository/cglib/cglib/3.2.5/cglib-3.2.5.jar:/Users/huangqingshi/.m2/repository/org/ow2/asm/asm/5.2/asm-5.2.jar:/Users/huangqingshi/.m2/repository/org/apache/ant/ant/1.9.6/ant-1.9.6.jar:/Users/huangqingshi/.m2/repository/org/apache/ant/ant-launcher/1.9.6/ant-launcher-1.9.6.jar oom.DirectBufferOOM
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Exception in thread "main" java.lang.OutOfMemoryError: Direct buffer memory
    at java.nio.Bits.reserveMemory(Bits.java:694)
    at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
    at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311)
    at oom.DirectBufferOOM.main(DirectBufferOOM.java:18)

Process finished with exit code 1

  這種情況是我們使用直接記憶體造成溢位,這個時候我們需要檢查一下程式裡邊是否使用的NIO及NIO,比如Netty,裡邊的直接記憶體的配置。

  第6種情況,JDK1.6之後新增了一個錯誤型別,如果堆記憶體太小的時候會報這個錯誤。如果98%的GC的時候回收不到2%的時候會報這個錯誤,也就是最小最大記憶體出現了問題的時候會報這個錯誤。如果程式碼配置了最小最大堆記憶體都為10m。

-Xmx10m -Xms10m

package oom;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * @author huangqingshi
 * @Date 2020-07-18
 */
public class GCOverheadOOM {

    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(5);
        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            executor.execute(() -> {
                try {
                    Thread.sleep(10000);
                } catch (InterruptedException e) {
                    //do nothing
                }
            });
        }

    }

}

  這個我們建立了一個執行緒池,如果執行緒池執行的時候如果核心執行緒處理不過來的時候會把資料放到LinkedBlockingQueue裡邊,也就是堆記憶體當中。這個時候我們需要檢查-Xms -Xmx最小最大堆配置是否合理。再一個dump出現當前記憶體來分析一下是否使用了大量的迴圈或使用大量記憶體程式碼。

  以上就是我們經常遇到的情況,我們需要針對出現的不行情況進行分析和處理。

 

   

  

  

&n